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Facebook turns over mother and daughter’s chat history to police resulting in abortion charges
(www.theverge.com)
This is a most excellent place for technology news and articles.
Maybe you're right, but I'd be hesitant to say WhatsApp user's contacts list would be worth US$ 20B.
My theory is they bought WhatsApp just because it was organically growing to be the dominant messaging app, and Facebook didn't want to lose this marked and bought them to squash the competition.
The WhatsApp Business stuff is a more recent development. When FB bought them they had very little to work with.